Fire Emblem Cameos
Credits: Nindb.net, King Marth 64 (finding some references), Hardin (finding references from Glory of Heracles and Metal Combat: Falcon's Revenge), DancingDanny (Trace Memory screenshot), Super Mecha Death Christ (finding the Console Wars Anime referrences), Samias (finding the Penny Arcade comic), FE Wikia, and Fire Emblem online
This is a list of some Fire Emblem references and cameos in popular culture.
In the Great Cave Offensive, the Falchion, a weapon which first appeared in Dark Dragon and Sword of Light, made a cameo as one of the treasures and items along with the other items from other Nintendo games. In the English version of Kirby Super Star, the Falchion is referred to as just "Sword". However, in the English version of the remake, Kirby Super Star Ultra, the Falchion is referred to as "Falchion".
"There's this one game that just absolutely rules. It's called "Fire Emblem"..." - Young Toad raves about Fire Emblem to Mario
In Petal Meadows village, there is a young Toad that you can talk to you and he says that his favorite video game is "Fire Emblem" (referring to Blazing Sword). Paper Mario was also developed by Intelligent Systems.
The "Fire Emblem" opera theme from the Dark Dragon and Sword of Light and Sword of Seals commercials featured in the Japan-only Donkey Konga 3.
The "Fire Emblem" track in the game includes Dark Dragon and Sword of Light's Theme and Map ~ Player Attack in the song.
In the Golden Bird Room, before you pick up the E Book, the leftmost book is called "Path of Radiance", a reference to Path of Radiance on the GameCube.
Archanea (a nation that first appeared in Dark Dragon and Sword of Light) was referred by Princess Piazza when she crafts a lie to get onto Trantian's giant wooden horse, while heading for Troy:
"I am Princess Piazza, representative of Trantia's ally nation of, er, Archanea" - Princess Piazza in Glory of Heracles referencing Archanea.
The level up music from Dark Dragon and Sword of Light and Fire Emblem: Gaiden was used in Metal Combat: Falcon's Revenge (which was also developed by Intelligent Systems).
Fare is a character representing Fire Emblem in the manga and anime World War Blue, a reimaging of the console wars between Nintendo and Sega.
Source: Nintendo Gamer.net
Friends With Menefits
In the official comic section from the Penny Arcade's official website featured a mini comic called "Friends With Menefits" that features the references from Fire Emblem: Awakening. It have a references of the Support Game Play and two playable characters: Chrom and Frederick. But, the guy in the motorcycle helmet claims that he did get a S Support for Chrom and Frederick together and he can't get them to married each other.
Note: In Fire Emblem: Awakening, the player cannot get a S support between with two male units, the S support only allows if some of the Male Unit and Female Units to get married. This is kinda more like a joke in the comic.
Source: Official Penny Arcade website